Roller tip rocker adjustment?

Being centered, and the width of the patch, are two independent geometrical issues; narrow (good) or wide (not so good) contact patches can occur with the patch centered or not.

The width of the patch is related to the total angle though which the rocker tip sweeps relative to the centerline angle of the valve stem. (The rocker's part of that angle is from the centerline of the rocker shaft to the contact point of the roller to the valve tip....ooops, to the center of the roller axle.) If the geometry is such that this angle is exactly 90 degrees as the rocker passes through the center of lift, then that is the optimum geometry for that lift. The higher lift, the wider the patch will be, even when optimized, unless you make the rocker arms longer. This geometry can be messed up with valve tip height or rocker design. (Wish I was where I could draw something up and post it for illustration.)

If the above is off, then the patch will also coincidentially move off center, but the patch will move towards the inside, not towards the outside (shaft system). And the Lunati linked article does not apply here unless you can move the shaft DOWN (mill the stands) or lengthen the valves; this Lunati article applies to stud rockers where the adjustments DO move the rocker fulcrum vertically.

Interesting video clip but you can't make conclusions in roller tip centering from that. The internal vibrations in the springs are internal resonances in the spring and valve mass. The rollers being on or off center have nothing to do with those motions or vibrations.